Just as a thought, I think tha'ts true, but not all isosurface's are
representable with heightfields .. many of them are concave.

I think that gets back to 'tesselation isn't trivial'.

However, for many ISO's, I think this would be a good idea; it could reduce
rendering time.

                  == John ==

"Warp" <war### [at] tagpovrayorg> wrote in message
news:3c2b75cd@news.povray.org...
> Mike Williams <mik### [at] nospamplease> wrote:
> : if you can convert from
>
> :                 F(x,y,z) = 0
> : to
> :                 z = G(x,y)
>
> ... then it's just a heightfield which is pretty easy to create. You
> can even use the function image feature for creating an actual
height_field
> object (which should render even faster than a mesh).
>
> --
> #macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb
x]
> [1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
> -1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// -
Warp -

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